+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <asm/cpu.h>
#include <asm/stackprotector.h>
-#ifdef CONFIG_DEBUG_PER_CPU_MAPS
-# define DBG(x...) printk(KERN_DEBUG x)
-#else
-# define DBG(x...)
-#endif
-
DEFINE_PER_CPU(int, cpu_number);
EXPORT_PER_CPU_SYMBOL(cpu_number);
#define PERCPU_FIRST_CHUNK_RESERVE 0
#endif
+#ifdef CONFIG_X86_32
/**
* pcpu_need_numa - determine percpu allocation needs to consider NUMA
*
#endif
return false;
}
+#endif
/**
* pcpu_alloc_bootmem - NUMA friendly alloc_bootmem wrapper for percpu
} else {
ptr = __alloc_bootmem_node_nopanic(NODE_DATA(node),
size, align, goal);
- pr_debug("per cpu data for cpu%d %lu bytes on node%d at "
- "%016lx\n", cpu, size, node, __pa(ptr));
+ pr_debug("per cpu data for cpu%d %lu bytes on node%d at %016lx\n",
+ cpu, size, node, __pa(ptr));
}
return ptr;
#else
/*
* Helpers for first chunk memory allocation
*/
-static void * __init pcpu_fc_alloc(unsigned int cpu, size_t size)
+static void * __init pcpu_fc_alloc(unsigned int cpu, size_t size, size_t align)
{
- return pcpu_alloc_bootmem(cpu, size, size);
+ return pcpu_alloc_bootmem(cpu, size, align);
}
static void __init pcpu_fc_free(void *ptr, size_t size)
free_bootmem(__pa(ptr), size);
}
-/*
- * Large page remapping allocator
- */
-#ifdef CONFIG_NEED_MULTIPLE_NODES
-static void __init pcpul_map(void *ptr, size_t size, void *addr)
+static int __init pcpu_cpu_distance(unsigned int from, unsigned int to)
{
- pmd_t *pmd, pmd_v;
-
- pmd = populate_extra_pmd((unsigned long)addr);
- pmd_v = pfn_pmd(page_to_pfn(virt_to_page(ptr)), PAGE_KERNEL_LARGE);
- set_pmd(pmd, pmd_v);
-}
-
-static ssize_t __init setup_pcpu_lpage(size_t static_size, bool chosen)
-{
- size_t reserve = PERCPU_MODULE_RESERVE + PERCPU_DYNAMIC_RESERVE;
-
- if (!chosen) {
- size_t vm_size = VMALLOC_END - VMALLOC_START;
- size_t tot_size = num_possible_cpus() * PMD_SIZE;
-
- /* on non-NUMA, embedding is better */
- if (!pcpu_need_numa())
- return -EINVAL;
-
- /* don't consume more than 20% of vmalloc area */
- if (tot_size > vm_size / 5) {
- pr_info("PERCPU: too large chunk size %zuMB for "
- "large page remap\n", tot_size >> 20);
- return -EINVAL;
- }
- }
-
- /* need PSE */
- if (!cpu_has_pse) {
- pr_warning("PERCPU: lpage allocator requires PSE\n");
- return -EINVAL;
- }
-
- return pcpu_lpage_first_chunk(static_size, PERCPU_FIRST_CHUNK_RESERVE,
- reserve - PERCPU_FIRST_CHUNK_RESERVE,
- PMD_SIZE,
- pcpu_fc_alloc, pcpu_fc_free, pcpul_map);
-}
+#ifdef CONFIG_NEED_MULTIPLE_NODES
+ if (early_cpu_to_node(from) == early_cpu_to_node(to))
+ return LOCAL_DISTANCE;
+ else
+ return REMOTE_DISTANCE;
#else
-static ssize_t __init setup_pcpu_lpage(size_t static_size, bool chosen)
-{
- return -EINVAL;
-}
+ return LOCAL_DISTANCE;
#endif
-
-/*
- * Embedding allocator
- *
- * The first chunk is sized to just contain the static area plus
- * module and dynamic reserves and embedded into linear physical
- * mapping so that it can use PMD mapping without additional TLB
- * pressure.
- */
-static ssize_t __init setup_pcpu_embed(size_t static_size, bool chosen)
-{
- size_t reserve = PERCPU_MODULE_RESERVE + PERCPU_DYNAMIC_RESERVE;
-
- /*
- * If large page isn't supported, there's no benefit in doing
- * this. Also, embedding allocation doesn't play well with
- * NUMA.
- */
- if (!chosen && (!cpu_has_pse || pcpu_need_numa()))
- return -EINVAL;
-
- return pcpu_embed_first_chunk(static_size, PERCPU_FIRST_CHUNK_RESERVE,
- reserve - PERCPU_FIRST_CHUNK_RESERVE);
}
-/*
- * 4k allocator
- *
- * Boring fallback 4k allocator. This allocator puts more pressure on
- * PTE TLBs but other than that behaves nicely on both UMA and NUMA.
- */
-static void __init pcpu4k_populate_pte(unsigned long addr)
+static void __init pcpup_populate_pte(unsigned long addr)
{
populate_extra_pte(addr);
}
-static ssize_t __init setup_pcpu_4k(size_t static_size)
-{
- return pcpu_4k_first_chunk(static_size, PERCPU_FIRST_CHUNK_RESERVE,
- pcpu_fc_alloc, pcpu_fc_free,
- pcpu4k_populate_pte);
-}
-
-/* for explicit first chunk allocator selection */
-static char pcpu_chosen_alloc[16] __initdata;
-
-static int __init percpu_alloc_setup(char *str)
-{
- strncpy(pcpu_chosen_alloc, str, sizeof(pcpu_chosen_alloc) - 1);
- return 0;
-}
-early_param("percpu_alloc", percpu_alloc_setup);
-
static inline void setup_percpu_segment(int cpu)
{
#ifdef CONFIG_X86_32
void __init setup_per_cpu_areas(void)
{
- size_t static_size = __per_cpu_end - __per_cpu_start;
unsigned int cpu;
unsigned long delta;
- size_t pcpu_unit_size;
- ssize_t ret;
+ int rc;
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);
/*
- * Allocate percpu area. If PSE is supported, try to make use
- * of large page mappings. Please read comments on top of
- * each allocator for details.
+ * Allocate percpu area. Embedding allocator is our favorite;
+ * however, on NUMA configurations, it can result in very
+ * sparse unit mapping and vmalloc area isn't spacious enough
+ * on 32bit. Use page in that case.
*/
- ret = -EINVAL;
- if (strlen(pcpu_chosen_alloc)) {
- if (strcmp(pcpu_chosen_alloc, "4k")) {
- if (!strcmp(pcpu_chosen_alloc, "lpage"))
- ret = setup_pcpu_lpage(static_size, true);
- else if (!strcmp(pcpu_chosen_alloc, "embed"))
- ret = setup_pcpu_embed(static_size, true);
- else
- pr_warning("PERCPU: unknown allocator %s "
- "specified\n", pcpu_chosen_alloc);
- if (ret < 0)
- pr_warning("PERCPU: %s allocator failed (%zd), "
- "falling back to 4k\n",
- pcpu_chosen_alloc, ret);
- }
- } else {
- ret = setup_pcpu_lpage(static_size, false);
- if (ret < 0)
- ret = setup_pcpu_embed(static_size, false);
- }
- if (ret < 0)
- ret = setup_pcpu_4k(static_size);
- if (ret < 0)
- panic("cannot allocate static percpu area (%zu bytes, err=%zd)",
- static_size, ret);
+#ifdef CONFIG_X86_32
+ if (pcpu_chosen_fc == PCPU_FC_AUTO && pcpu_need_numa())
+ pcpu_chosen_fc = PCPU_FC_PAGE;
+#endif
+ rc = -EINVAL;
+ if (pcpu_chosen_fc != PCPU_FC_PAGE) {
+ const size_t dyn_size = PERCPU_MODULE_RESERVE +
+ PERCPU_DYNAMIC_RESERVE - PERCPU_FIRST_CHUNK_RESERVE;
+ size_t atom_size;
- pcpu_unit_size = ret;
+ /*
+ * On 64bit, use PMD_SIZE for atom_size so that embedded
+ * percpu areas are aligned to PMD. This, in the future,
+ * can also allow using PMD mappings in vmalloc area. Use
+ * PAGE_SIZE on 32bit as vmalloc space is highly contended
+ * and large vmalloc area allocs can easily fail.
+ */
+#ifdef CONFIG_X86_64
+ atom_size = PMD_SIZE;
+#else
+ atom_size = PAGE_SIZE;
+#endif
+ rc = pcpu_embed_first_chunk(PERCPU_FIRST_CHUNK_RESERVE,
+ dyn_size, atom_size,
+ pcpu_cpu_distance,
+ pcpu_fc_alloc, pcpu_fc_free);
+ if (rc < 0)
+ pr_warning("%s allocator failed (%d), falling back to page size\n",
+ pcpu_fc_names[pcpu_chosen_fc], rc);
+ }
+ if (rc < 0)
+ rc = pcpu_page_first_chunk(PERCPU_FIRST_CHUNK_RESERVE,
+ pcpu_fc_alloc, pcpu_fc_free,
+ pcpup_populate_pte);
+ if (rc < 0)
+ panic("cannot initialize percpu area (err=%d)", rc);
/* alrighty, percpu areas up and running */
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_offset(cpu) = delta + pcpu_unit_offsets[cpu];
per_cpu(this_cpu_off, cpu) = per_cpu_offset(cpu);
per_cpu(cpu_number, cpu) = cpu;
setup_percpu_segment(cpu);
* are zeroed indicating that the static arrays are
* gone.
*/
+#ifndef CONFIG_XEN
#ifdef CONFIG_X86_LOCAL_APIC
per_cpu(x86_cpu_to_apicid, cpu) =
early_per_cpu_map(x86_cpu_to_apicid, cpu);
per_cpu(x86_bios_cpu_apicid, cpu) =
early_per_cpu_map(x86_bios_cpu_apicid, cpu);
#endif
+#ifdef CONFIG_X86_32
+ per_cpu(x86_cpu_to_logical_apicid, cpu) =
+ early_per_cpu_map(x86_cpu_to_logical_apicid, cpu);
+#endif
+#endif
#ifdef CONFIG_X86_64
per_cpu(irq_stack_ptr, cpu) =
per_cpu(irq_stack_union.irq_stack, cpu) +
IRQ_STACK_SIZE - 64;
+#endif
#ifdef CONFIG_NUMA
per_cpu(x86_cpu_to_node_map, cpu) =
early_per_cpu_map(x86_cpu_to_node_map, cpu);
-#endif
+ /*
+ * Ensure that the boot cpu numa_node is correct when the boot
+ * cpu is on a node that doesn't have memory installed.
+ * Also cpu_up() will call cpu_to_node() for APs when
+ * MEMORY_HOTPLUG is defined, before per_cpu(numa_node) is set
+ * up later with c_init aka intel_init/amd_init.
+ * So set them all (boot cpu and all APs).
+ */
+ set_cpu_numa_node(cpu, early_cpu_to_node(cpu));
#endif
/*
- * Up to this point, the boot CPU has been using .data.init
+ * Up to this point, the boot CPU has been using .init.data
* area. Reload any changed state for the boot CPU.
*/
- if (cpu == boot_cpu_id)
+ if (!cpu)
switch_to_new_gdt(cpu);
}
/* indicate the early static arrays will soon be gone */
+#ifndef CONFIG_XEN
#ifdef CONFIG_X86_LOCAL_APIC
early_per_cpu_ptr(x86_cpu_to_apicid) = NULL;
early_per_cpu_ptr(x86_bios_cpu_apicid) = NULL;
#endif
-#if defined(CONFIG_X86_64) && defined(CONFIG_NUMA)
- early_per_cpu_ptr(x86_cpu_to_node_map) = NULL;
+#ifdef CONFIG_X86_32
+ early_per_cpu_ptr(x86_cpu_to_logical_apicid) = NULL;
#endif
-
-#if defined(CONFIG_X86_64) && defined(CONFIG_NUMA)
- /*
- * make sure boot cpu node_number is right, when boot cpu is on the
- * node that doesn't have mem installed
- */
- per_cpu(node_number, boot_cpu_id) = cpu_to_node(boot_cpu_id);
+#endif
+#ifdef CONFIG_NUMA
+ early_per_cpu_ptr(x86_cpu_to_node_map) = NULL;
#endif
/* Setup node to cpumask map */
projects / linux-flexiantxendom0-3.2.10.git / blobdiff