| Message ID | 20211121093557.139034-5-wangkefeng.wang@huawei.com (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | mm: percpu: Cleanup percpu first chunk funciton | expand |
On Sun, Nov 21, 2021 at 05:35:57PM +0800, Kefeng Wang wrote: > When NEED_PER_CPU_PAGE_FIRST_CHUNK enabled, we need a function to > populate pte, add a generic pcpu populate pte function and switch > to use it. > > Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com> > --- > arch/powerpc/kernel/setup_64.c | 47 +-------------------- > arch/sparc/kernel/smp_64.c | 57 +------------------------ > arch/x86/kernel/setup_percpu.c | 5 +-- > drivers/base/arch_numa.c | 51 +--------------------- > include/linux/percpu.h | 5 +-- > mm/percpu.c | 77 +++++++++++++++++++++++++++++++--- > 6 files changed, 79 insertions(+), 163 deletions(-) > > diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c > index 364b1567f822..1a17828af77f 100644 > --- a/arch/powerpc/kernel/setup_64.c > +++ b/arch/powerpc/kernel/setup_64.c > @@ -788,51 +788,6 @@ static int pcpu_cpu_distance(unsigned int from, unsigned int to) > 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; > @@ -861,7 +816,7 @@ 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); > > diff --git a/arch/sparc/kernel/smp_64.c b/arch/sparc/kernel/smp_64.c > index 198dadddb75d..00dffe2d834b 100644 > --- a/arch/sparc/kernel/smp_64.c > +++ b/arch/sparc/kernel/smp_64.c > @@ -1534,59 +1534,6 @@ static int __init pcpu_cpu_distance(unsigned int from, unsigned int to) > return REMOTE_DISTANCE; > } > > -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; > @@ -1604,9 +1551,7 @@ void __init setup_per_cpu_areas(void) > pcpu_fc_names[pcpu_chosen_fc], rc); > } > if (rc < 0) > - rc = pcpu_page_first_chunk(PERCPU_MODULE_RESERVE, > - cpu_to_node, > - pcpu_populate_pte); > + rc = pcpu_page_first_chunk(PERCPU_MODULE_RESERVE, cpu_to_node); > if (rc < 0) > panic("cannot initialize percpu area (err=%d)", rc); > > diff --git a/arch/x86/kernel/setup_percpu.c b/arch/x86/kernel/setup_percpu.c > index cd672bd46241..4eadbe45078e 100644 > --- a/arch/x86/kernel/setup_percpu.c > +++ b/arch/x86/kernel/setup_percpu.c > @@ -101,7 +101,7 @@ static int __init pcpu_cpu_to_node(int cpu) > return IS_ENABLED(CONFIG_NUMA) ? early_cpu_to_node(cpu) : NUMA_NO_NODE; > } > > -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); x86 has it's own implementation that differs for 32 bit. I'm not confident this is correct to drop in as a replacement for x86, so I'd prefer to keep populate_pte_fn() around. > if (rc < 0) > panic("cannot initialize percpu area (err=%d)", rc); > > diff --git a/drivers/base/arch_numa.c b/drivers/base/arch_numa.c > index 23a10cc36165..eaa31e567d1e 100644 > --- a/drivers/base/arch_numa.c > +++ b/drivers/base/arch_numa.c > @@ -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); > diff --git a/include/linux/percpu.h b/include/linux/percpu.h > index d73c97ef4ff4..f1ec5ad1351c 100644 > --- a/include/linux/percpu.h > +++ b/include/linux/percpu.h > @@ -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); > diff --git a/mm/percpu.c b/mm/percpu.c > index efaa1cbaf73d..d907daed04eb 100644 > --- a/mm/percpu.c > +++ b/mm/percpu.c > @@ -3162,11 +3162,80 @@ int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size, > #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_from(P4D_TABLE_SIZE, P4D_TABLE_SIZE, PAGE_SIZE); It's unnecessary to specify a min_addr to memblock_alloc_from() as it won't allocate 0 anyway. So please use memblock_alloc() instead. > + 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(PUD_TABLE_SIZE, PUD_TABLE_SIZE, PAGE_SIZE); See above. > + 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(PMD_TABLE_SIZE, PMD_TABLE_SIZE, PAGE_SIZE); See above. > + 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(PTE_TABLE_SIZE, PTE_TABLE_SIZE, PAGE_SIZE); See above. > + 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); > +} > + > /** > * 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. > @@ -3177,9 +3246,7 @@ int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size, > * 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; > @@ -3243,7 +3310,7 @@ 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], > -- > 2.26.2 >
On 2021/11/30 6:49, Dennis Zhou wrote: > On Sun, Nov 21, 2021 at 05:35:57PM +0800, Kefeng Wang wrote: >> When NEED_PER_CPU_PAGE_FIRST_CHUNK enabled, we need a function to >> populate pte, add a generic pcpu populate pte function and switch >> to use it. >> >> Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com> >> --- >> arch/powerpc/kernel/setup_64.c | 47 +-------------------- >> arch/sparc/kernel/smp_64.c | 57 +------------------------ >> arch/x86/kernel/setup_percpu.c | 5 +-- >> drivers/base/arch_numa.c | 51 +--------------------- >> include/linux/percpu.h | 5 +-- >> mm/percpu.c | 77 +++++++++++++++++++++++++++++++--- >> 6 files changed, 79 insertions(+), 163 deletions(-) >> ... >> diff --git a/arch/x86/kernel/setup_percpu.c b/arch/x86/kernel/setup_percpu.c >> index cd672bd46241..4eadbe45078e 100644 >> --- a/arch/x86/kernel/setup_percpu.c >> +++ b/arch/x86/kernel/setup_percpu.c >> @@ -101,7 +101,7 @@ static int __init pcpu_cpu_to_node(int cpu) >> return IS_ENABLED(CONFIG_NUMA) ? early_cpu_to_node(cpu) : NUMA_NO_NODE; >> } >> >> -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); > x86 has it's own implementation that differs for 32 bit. I'm not > confident this is correct to drop in as a replacement for x86, so I'd > prefer to keep populate_pte_fn() around. The x86's pcpup_populate_pte() version is not dropped. We define a __weak pcpu_populate_pte function in mm/percpu.c, and there is a own version on x86, so no function change on x86. I will add this into changelog, arch/x86/kernel/setup_percpu.c: void __init pcpu_populate_pte(unsigned long addr) include/linux/percpu.h: void __init pcpu_populate_pte(unsigned long addr); mm/percpu.c: void __init __weak pcpu_populate_pte(unsigned long addr) mm/percpu.c: pcpu_populate_pte(unit_addr + (i << PAGE_SHIFT)); >> diff --git a/include/linux/percpu.h b/include/linux/percpu.h >> index d73c97ef4ff4..f1ec5ad1351c 100644 >> --- a/include/linux/percpu.h >> +++ b/include/linux/percpu.h >> @@ -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); >> diff --git a/mm/percpu.c b/mm/percpu.c >> index efaa1cbaf73d..d907daed04eb 100644 >> --- a/mm/percpu.c >> +++ b/mm/percpu.c >> @@ -3162,11 +3162,80 @@ int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size, >> #endif /* BUILD_EMBED_FIRST_CHUNK */ >> ... >> +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_from(P4D_TABLE_SIZE, P4D_TABLE_SIZE, PAGE_SIZE); > It's unnecessary to specify a min_addr to memblock_alloc_from() as it > won't allocate 0 anyway. So please use memblock_alloc() instead. ok, will use memblock_alloc in this function
diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c index 364b1567f822..1a17828af77f 100644 --- a/arch/powerpc/kernel/setup_64.c +++ b/arch/powerpc/kernel/setup_64.c @@ -788,51 +788,6 @@ static int pcpu_cpu_distance(unsigned int from, unsigned int to) 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; @@ -861,7 +816,7 @@ 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); diff --git a/arch/sparc/kernel/smp_64.c b/arch/sparc/kernel/smp_64.c index 198dadddb75d..00dffe2d834b 100644 --- a/arch/sparc/kernel/smp_64.c +++ b/arch/sparc/kernel/smp_64.c @@ -1534,59 +1534,6 @@ static int __init pcpu_cpu_distance(unsigned int from, unsigned int to) return REMOTE_DISTANCE; } -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; @@ -1604,9 +1551,7 @@ void __init setup_per_cpu_areas(void) pcpu_fc_names[pcpu_chosen_fc], rc); } if (rc < 0) - rc = pcpu_page_first_chunk(PERCPU_MODULE_RESERVE, - cpu_to_node, - pcpu_populate_pte); + rc = pcpu_page_first_chunk(PERCPU_MODULE_RESERVE, cpu_to_node); if (rc < 0) panic("cannot initialize percpu area (err=%d)", rc); diff --git a/arch/x86/kernel/setup_percpu.c b/arch/x86/kernel/setup_percpu.c index cd672bd46241..4eadbe45078e 100644 --- a/arch/x86/kernel/setup_percpu.c +++ b/arch/x86/kernel/setup_percpu.c @@ -101,7 +101,7 @@ static int __init pcpu_cpu_to_node(int cpu) return IS_ENABLED(CONFIG_NUMA) ? early_cpu_to_node(cpu) : NUMA_NO_NODE; } -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); diff --git a/drivers/base/arch_numa.c b/drivers/base/arch_numa.c index 23a10cc36165..eaa31e567d1e 100644 --- a/drivers/base/arch_numa.c +++ b/drivers/base/arch_numa.c @@ -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); diff --git a/include/linux/percpu.h b/include/linux/percpu.h index d73c97ef4ff4..f1ec5ad1351c 100644 --- a/include/linux/percpu.h +++ b/include/linux/percpu.h @@ -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); diff --git a/mm/percpu.c b/mm/percpu.c index efaa1cbaf73d..d907daed04eb 100644 --- a/mm/percpu.c +++ b/mm/percpu.c @@ -3162,11 +3162,80 @@ int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size, #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_from(P4D_TABLE_SIZE, P4D_TABLE_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(PUD_TABLE_SIZE, PUD_TABLE_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(PMD_TABLE_SIZE, PMD_TABLE_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(PTE_TABLE_SIZE, PTE_TABLE_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); +} + /** * 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. @@ -3177,9 +3246,7 @@ int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size, * 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; @@ -3243,7 +3310,7 @@ 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],
When NEED_PER_CPU_PAGE_FIRST_CHUNK enabled, we need a function to populate pte, add a generic pcpu populate pte function and switch to use it. Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com> --- arch/powerpc/kernel/setup_64.c | 47 +-------------------- arch/sparc/kernel/smp_64.c | 57 +------------------------ arch/x86/kernel/setup_percpu.c | 5 +-- drivers/base/arch_numa.c | 51 +--------------------- include/linux/percpu.h | 5 +-- mm/percpu.c | 77 +++++++++++++++++++++++++++++++--- 6 files changed, 79 insertions(+), 163 deletions(-)