1 files changed, 45 insertions, 319 deletions

diff --git a/arch/x86/kernel/setup_percpu.c b/arch/x86/kernel/setup_percpu.c
index 07d81916f212..d559af913e1f 100644
--- a/arch/x86/kernel/setup_percpu.c
+++ b/arch/x86/kernel/setup_percpu.c
@@ -55,6 +55,7 @@ EXPORT_SYMBOL(__per_cpu_offset);
 #define PERCPU_FIRST_CHUNK_RESERVE      0
 #endif
 
+#ifdef CONFIG_X86_32
 /**
  * pcpu_need_numa - determine percpu allocation needs to consider NUMA
  *
@@ -83,6 +84,7 @@ static bool __init pcpu_need_numa(void)
 #endif
         return false;
 }
+#endif
 
 /**
  * pcpu_alloc_bootmem - NUMA friendly alloc_bootmem wrapper for percpu
@@ -124,308 +126,35 @@ static void * __init pcpu_alloc_bootmem(unsigned int cpu, unsigned long size,
 }
 
 /*
- * Large page remap allocator
- *
- * This allocator uses PMD page as unit.  A PMD page is allocated for
- * each cpu and each is remapped into vmalloc area using PMD mapping.
- * As PMD page is quite large, only part of it is used for the first
- * chunk.  Unused part is returned to the bootmem allocator.
- *
- * So, the PMD pages are mapped twice - once to the physical mapping
- * and to the vmalloc area for the first percpu chunk.  The double
- * mapping does add one more PMD TLB entry pressure but still is much
- * better than only using 4k mappings while still being NUMA friendly.
+ * Helpers for first chunk memory allocation
  */
-#ifdef CONFIG_NEED_MULTIPLE_NODES
-struct pcpul_ent {
-        unsigned int    cpu;
-        void            *ptr;
-};
-
-static size_t pcpul_size;
-static struct pcpul_ent *pcpul_map;
-static struct vm_struct pcpul_vm;
-
-static struct page * __init pcpul_get_page(unsigned int cpu, int pageno)
+static void * __init pcpu_fc_alloc(unsigned int cpu, size_t size, size_t align)
 {
-        size_t off = (size_t)pageno << PAGE_SHIFT;
-
-        if (off >= pcpul_size)
-                return NULL;
-
-        return virt_to_page(pcpul_map[cpu].ptr + off);
+        return pcpu_alloc_bootmem(cpu, size, align);
 }
 
-static ssize_t __init setup_pcpu_lpage(size_t static_size, bool chosen)
+static void __init pcpu_fc_free(void *ptr, size_t size)
 {
-        size_t map_size, dyn_size;
-        unsigned int cpu;
-        int i, j;
-        ssize_t ret;
-
-        if (!chosen) {
-                size_t vm_size = VMALLOC_END - VMALLOC_START;
-                size_t tot_size = nr_cpu_ids * 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;
-        }
-
-        /*
-         * Currently supports only single page.  Supporting multiple
-         * pages won't be too difficult if it ever becomes necessary.
-         */
-        pcpul_size = PFN_ALIGN(static_size + PERCPU_MODULE_RESERVE +
-                               PERCPU_DYNAMIC_RESERVE);
-        if (pcpul_size > PMD_SIZE) {
-                pr_warning("PERCPU: static data is larger than large page, "
-                           "can't use large page\n");
-                return -EINVAL;
-        }
-        dyn_size = pcpul_size - static_size - PERCPU_FIRST_CHUNK_RESERVE;
-
-        /* allocate pointer array and alloc large pages */
-        map_size = PFN_ALIGN(nr_cpu_ids * sizeof(pcpul_map[0]));
-        pcpul_map = alloc_bootmem(map_size);
-
-        for_each_possible_cpu(cpu) {
-                pcpul_map[cpu].cpu = cpu;
-                pcpul_map[cpu].ptr = pcpu_alloc_bootmem(cpu, PMD_SIZE,
-                                                        PMD_SIZE);
-                if (!pcpul_map[cpu].ptr) {
-                        pr_warning("PERCPU: failed to allocate large page "
-                                   "for cpu%u\n", cpu);
-                        goto enomem;
-                }
-
-                /*
-                 * Only use pcpul_size bytes and give back the rest.
-                 *
-                 * Ingo: The 2MB up-rounding bootmem is needed to make
-                 * sure the partial 2MB page is still fully RAM - it's
-                 * not well-specified to have a PAT-incompatible area
-                 * (unmapped RAM, device memory, etc.) in that hole.
-                 */
-                free_bootmem(__pa(pcpul_map[cpu].ptr + pcpul_size),
-                             PMD_SIZE - pcpul_size);
-
-                memcpy(pcpul_map[cpu].ptr, __per_cpu_load, static_size);
-        }
-
-        /* allocate address and map */
-        pcpul_vm.flags = VM_ALLOC;
-        pcpul_vm.size = nr_cpu_ids * PMD_SIZE;
-        vm_area_register_early(&pcpul_vm, PMD_SIZE);
-
-        for_each_possible_cpu(cpu) {
-                pmd_t *pmd, pmd_v;
-
-                pmd = populate_extra_pmd((unsigned long)pcpul_vm.addr +
-                                         cpu * PMD_SIZE);
-                pmd_v = pfn_pmd(page_to_pfn(virt_to_page(pcpul_map[cpu].ptr)),
-                                PAGE_KERNEL_LARGE);
-                set_pmd(pmd, pmd_v);
-        }
-
-        /* we're ready, commit */
-        pr_info("PERCPU: Remapped at %p with large pages, static data "
-                "%zu bytes\n", pcpul_vm.addr, static_size);
-
-        ret = pcpu_setup_first_chunk(pcpul_get_page, static_size,
-                                     PERCPU_FIRST_CHUNK_RESERVE, dyn_size,
-                                     PMD_SIZE, pcpul_vm.addr, NULL);
-
-        /* sort pcpul_map array for pcpu_lpage_remapped() */
-        for (i = 0; i < nr_cpu_ids - 1; i++)
-                for (j = i + 1; j < nr_cpu_ids; j++)
-                        if (pcpul_map[i].ptr > pcpul_map[j].ptr) {
-                                struct pcpul_ent tmp = pcpul_map[i];
-                                pcpul_map[i] = pcpul_map[j];
-                                pcpul_map[j] = tmp;
-                        }
-
-        return ret;
-
-enomem:
-        for_each_possible_cpu(cpu)
-                if (pcpul_map[cpu].ptr)
-                        free_bootmem(__pa(pcpul_map[cpu].ptr), pcpul_size);
-        free_bootmem(__pa(pcpul_map), map_size);
-        return -ENOMEM;
+        free_bootmem(__pa(ptr), size);
 }
 
-/**
- * pcpu_lpage_remapped - determine whether a kaddr is in pcpul recycled area
- * @kaddr: the kernel address in question
- *
- * Determine whether @kaddr falls in the pcpul recycled area.  This is
- * used by pageattr to detect VM aliases and break up the pcpu PMD
- * mapping such that the same physical page is not mapped under
- * different attributes.
- *
- * The recycled area is always at the tail of a partially used PMD
- * page.
- *
- * RETURNS:
- * Address of corresponding remapped pcpu address if match is found;
- * otherwise, NULL.
- */
-void *pcpu_lpage_remapped(void *kaddr)
+static int __init pcpu_cpu_distance(unsigned int from, unsigned int to)
 {
-        void *pmd_addr = (void *)((unsigned long)kaddr & PMD_MASK);
-        unsigned long offset = (unsigned long)kaddr & ~PMD_MASK;
-        int left = 0, right = nr_cpu_ids - 1;
-        int pos;
-
-        /* pcpul in use at all? */
-        if (!pcpul_map)
-                return NULL;
-
-        /* okay, perform binary search */
-        while (left <= right) {
-                pos = (left + right) / 2;
-
-                if (pcpul_map[pos].ptr < pmd_addr)
-                        left = pos + 1;
-                else if (pcpul_map[pos].ptr > pmd_addr)
-                        right = pos - 1;
-                else {
-                        /* it shouldn't be in the area for the first chunk */
-                        WARN_ON(offset < pcpul_size);
-
-                        return pcpul_vm.addr +
-                                pcpul_map[pos].cpu * PMD_SIZE + offset;
-                }
-        }
-
-        return NULL;
-}
+#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, -1);
 }
 
-/*
- * 4k page allocator
- *
- * This is the basic allocator.  Static percpu area is allocated
- * page-by-page and most of initialization is done by the generic
- * setup function.
- */
-static struct page **pcpu4k_pages __initdata;
-static int pcpu4k_nr_static_pages __initdata;
-
-static struct page * __init pcpu4k_get_page(unsigned int cpu, int pageno)
-{
-        if (pageno < pcpu4k_nr_static_pages)
-                return pcpu4k_pages[cpu * pcpu4k_nr_static_pages + pageno];
-        return NULL;
-}
-
-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)
-{
-        size_t pages_size;
-        unsigned int cpu;
-        int i, j;
-        ssize_t ret;
-
-        pcpu4k_nr_static_pages = PFN_UP(static_size);
-
-        /* unaligned allocations can't be freed, round up to page size */
-        pages_size = PFN_ALIGN(pcpu4k_nr_static_pages * nr_cpu_ids
-                               * sizeof(pcpu4k_pages[0]));
-        pcpu4k_pages = alloc_bootmem(pages_size);
-
-        /* allocate and copy */
-        j = 0;
-        for_each_possible_cpu(cpu)
-                for (i = 0; i < pcpu4k_nr_static_pages; i++) {
-                        void *ptr;
-
-                        ptr = pcpu_alloc_bootmem(cpu, PAGE_SIZE, PAGE_SIZE);
-                        if (!ptr) {
-                                pr_warning("PERCPU: failed to allocate "
-                                           "4k page for cpu%u\n", cpu);
-                                goto enomem;
-                        }
-
-                        memcpy(ptr, __per_cpu_load + i * PAGE_SIZE, PAGE_SIZE);
-                        pcpu4k_pages[j++] = virt_to_page(ptr);
-                }
-
-        /* we're ready, commit */
-        pr_info("PERCPU: Allocated %d 4k pages, static data %zu bytes\n",
-                pcpu4k_nr_static_pages, static_size);
-
-        ret = pcpu_setup_first_chunk(pcpu4k_get_page, static_size,
-                                     PERCPU_FIRST_CHUNK_RESERVE, -1,
-                                     -1, NULL, pcpu4k_populate_pte);
-        goto out_free_ar;
-
-enomem:
-        while (--j >= 0)
-                free_bootmem(__pa(page_address(pcpu4k_pages[j])), PAGE_SIZE);
-        ret = -ENOMEM;
-out_free_ar:
-        free_bootmem(__pa(pcpu4k_pages), pages_size);
-        return ret;
-}
-
-/* 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
@@ -441,52 +170,49 @@ static inline void setup_percpu_segment(int cpu)
 
 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);
+#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 atom_size = cpu_has_pse ? PMD_SIZE : PAGE_SIZE;
+                const size_t dyn_size = PERCPU_MODULE_RESERVE +
+                        PERCPU_DYNAMIC_RESERVE - PERCPU_FIRST_CHUNK_RESERVE;
+
+                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("PERCPU: %s allocator failed (%d), "
+                                   "falling back to page size\n",
+                                   pcpu_fc_names[pcpu_chosen_fc], rc);
         }
-        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);
-
-        pcpu_unit_size = ret;
+        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);