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Subject[PATCH 10/10] x86: convert to the new dynamic percpu allocator
Date
Impact: use new dynamic allocator, unified access to static/dynamic
percpu memory

Convert to the new dynamic percpu allocator.

* implement populate_extra_pte() for both 32 and 64
* update setup_per_cpu_areas() to use pcpu_setup_static()
* define __addr_to_pcpu_ptr() and __pcpu_ptr_to_addr()
* define config HAVE_DYNAMIC_PER_CPU_AREA

Signed-off-by: Tejun Heo <tj@kernel.org>
---
arch/x86/Kconfig | 3 ++
arch/x86/include/asm/percpu.h | 8 +++++
arch/x86/include/asm/pgtable.h | 1 +
arch/x86/kernel/setup_percpu.c | 62 +++++++++++++++++++++++++--------------
arch/x86/mm/init_32.c | 10 ++++++
arch/x86/mm/init_64.c | 19 ++++++++++++
6 files changed, 81 insertions(+), 22 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index f760a22..d3f6ead 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -135,6 +135,9 @@ config ARCH_HAS_CACHE_LINE_SIZE
config HAVE_SETUP_PER_CPU_AREA
def_bool y

+config HAVE_DYNAMIC_PER_CPU_AREA
+ def_bool y
+
config HAVE_CPUMASK_OF_CPU_MAP
def_bool X86_64_SMP

diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h
index aee103b..8f1d2fb 100644
--- a/arch/x86/include/asm/percpu.h
+++ b/arch/x86/include/asm/percpu.h
@@ -43,6 +43,14 @@
#else /* ...!ASSEMBLY */

#include <linux/stringify.h>
+#include <asm/sections.h>
+
+#define __addr_to_pcpu_ptr(addr) \
+ (void *)((unsigned long)(addr) - (unsigned long)pcpu_base_addr \
+ + (unsigned long)__per_cpu_start)
+#define __pcpu_ptr_to_addr(ptr) \
+ (void *)((unsigned long)(ptr) + (unsigned long)pcpu_base_addr \
+ - (unsigned long)__per_cpu_start)

#ifdef CONFIG_SMP
#define __percpu_arg(x) "%%"__stringify(__percpu_seg)":%P" #x
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 6f7c102..dd91c25 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -402,6 +402,7 @@ int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,

/* Install a pte for a particular vaddr in kernel space. */
void set_pte_vaddr(unsigned long vaddr, pte_t pte);
+void populate_extra_pte(unsigned long vaddr);

#ifdef CONFIG_X86_32
extern void native_pagetable_setup_start(pgd_t *base);
diff --git a/arch/x86/kernel/setup_percpu.c b/arch/x86/kernel/setup_percpu.c
index d992e6c..2dce435 100644
--- a/arch/x86/kernel/setup_percpu.c
+++ b/arch/x86/kernel/setup_percpu.c
@@ -61,38 +61,56 @@ static inline void setup_percpu_segment(int cpu)
*/
void __init setup_per_cpu_areas(void)
{
- ssize_t size;
- char *ptr;
- int cpu;
-
- /* Copy section for each CPU (we discard the original) */
- size = roundup(PERCPU_ENOUGH_ROOM, PAGE_SIZE);
+ ssize_t size = __per_cpu_end - __per_cpu_start;
+ unsigned int nr_cpu_pages = DIV_ROUND_UP(size, PAGE_SIZE);
+ static struct page **pages;
+ size_t pages_size;
+ unsigned int cpu, i, j;
+ unsigned long delta;
+ size_t pcpu_unit_size;

pr_info("NR_CPUS:%d nr_cpumask_bits:%d nr_cpu_ids:%d nr_node_ids:%d\n",
NR_CPUS, nr_cpumask_bits, nr_cpu_ids, nr_node_ids);
+ pr_info("PERCPU: Allocating %zd bytes for static per cpu data\n", size);

- pr_info("PERCPU: Allocating %zd bytes of per cpu data\n", size);
+ pages_size = nr_cpu_pages * num_possible_cpus() * sizeof(pages[0]);
+ pages = alloc_bootmem(pages_size);

+ j = 0;
for_each_possible_cpu(cpu) {
+ void *ptr;
+
+ for (i = 0; i < nr_cpu_pages; i++) {
#ifndef CONFIG_NEED_MULTIPLE_NODES
- ptr = alloc_bootmem_pages(size);
+ ptr = alloc_bootmem_pages(PAGE_SIZE);
#else
- int node = early_cpu_to_node(cpu);
- if (!node_online(node) || !NODE_DATA(node)) {
- ptr = alloc_bootmem_pages(size);
- pr_info("cpu %d has no node %d or node-local memory\n",
- cpu, node);
- pr_debug("per cpu data for cpu%d at %016lx\n",
- cpu, __pa(ptr));
- } else {
- ptr = alloc_bootmem_pages_node(NODE_DATA(node), size);
- pr_debug("per cpu data for cpu%d on node%d at %016lx\n",
- cpu, node, __pa(ptr));
- }
+ int node = early_cpu_to_node(cpu);
+
+ if (!node_online(node) || !NODE_DATA(node)) {
+ ptr = alloc_bootmem_pages(PAGE_SIZE);
+ pr_info("cpu %d has no node %d or node-local "
+ "memory\n", cpu, node);
+ pr_debug("per cpu data for cpu%d at %016lx\n",
+ cpu, __pa(ptr));
+ } else {
+ ptr = alloc_bootmem_pages_node(NODE_DATA(node),
+ PAGE_SIZE);
+ pr_debug("per cpu data for cpu%d on node%d "
+ "at %016lx\n", cpu, node, __pa(ptr));
+ }
#endif
+ memcpy(ptr, __per_cpu_load + i * PAGE_SIZE, PAGE_SIZE);
+ pages[j++] = virt_to_page(ptr);
+ }
+ }
+
+ pcpu_unit_size = pcpu_setup_static(populate_extra_pte, pages, size);

- memcpy(ptr, __per_cpu_load, __per_cpu_end - __per_cpu_start);
- per_cpu_offset(cpu) = ptr - __per_cpu_start;
+ free_bootmem(__pa(pages), pages_size);
+
+ delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
+ for_each_possible_cpu(cpu) {
+ per_cpu_offset(cpu) = delta + cpu * pcpu_unit_size;
per_cpu(this_cpu_off, cpu) = per_cpu_offset(cpu);
per_cpu(cpu_number, cpu) = cpu;
setup_percpu_segment(cpu);
diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index 00263bf..8b1a0ef 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -137,6 +137,16 @@ static pte_t * __init one_page_table_init(pmd_t *pmd)
return pte_offset_kernel(pmd, 0);
}

+void __init populate_extra_pte(unsigned long vaddr)
+{
+ int pgd_idx = pgd_index(vaddr);
+ int pmd_idx = pmd_index(vaddr);
+ pmd_t *pmd;
+
+ pmd = one_md_table_init(swapper_pg_dir + pgd_idx);
+ one_page_table_init(pmd + pmd_idx);
+}
+
static pte_t *__init page_table_kmap_check(pte_t *pte, pmd_t *pmd,
unsigned long vaddr, pte_t *lastpte)
{
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index e6d36b4..7f91e2c 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -223,6 +223,25 @@ set_pte_vaddr(unsigned long vaddr, pte_t pteval)
set_pte_vaddr_pud(pud_page, vaddr, pteval);
}

+void __init populate_extra_pte(unsigned long vaddr)
+{
+ pgd_t *pgd;
+ pud_t *pud;
+
+ pgd = pgd_offset_k(vaddr);
+ if (pgd_none(*pgd)) {
+ pud = (pud_t *)spp_getpage();
+ pgd_populate(&init_mm, pgd, pud);
+ if (pud != pud_offset(pgd, 0)) {
+ printk(KERN_ERR "PAGETABLE BUG #00! %p <-> %p\n",
+ pud, pud_offset(pgd, 0));
+ return;
+ }
+ }
+
+ set_pte_vaddr_pud((pud_t *)pgd_page_vaddr(*pgd), vaddr, __pte(0));
+}
+
/*
* Create large page table mappings for a range of physical addresses.
*/
--
1.6.0.2


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