sparc64: Use new dynamic per-cpu allocator.

Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 159 insertions, 9 deletions

diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index cc12cd48bbc5..2185cf946d68 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -93,6 +93,9 @@ config AUDIT_ARCH
 config HAVE_SETUP_PER_CPU_AREA
         def_bool y if SPARC64
 
+config HAVE_DYNAMIC_PER_CPU_AREA
+        def_bool y if SPARC64
+
 config GENERIC_HARDIRQS_NO__DO_IRQ
         bool
         def_bool y if SPARC64
diff --git a/arch/sparc/kernel/smp_64.c b/arch/sparc/kernel/smp_64.c
index 567a6a47ba23..1de47d2169c8 100644
--- a/arch/sparc/kernel/smp_64.c
+++ b/arch/sparc/kernel/smp_64.c
@@ -21,6 +21,7 @@
 #include <linux/jiffies.h>
 #include <linux/profile.h>
 #include <linux/bootmem.h>
+#include <linux/vmalloc.h>
 #include <linux/cpu.h>
 
 #include <asm/head.h>
@@ -1371,19 +1372,165 @@ void smp_send_stop(void)
 {
 }
 
+/**
+ * pcpu_alloc_bootmem - NUMA friendly alloc_bootmem wrapper for percpu
+ * @cpu: cpu to allocate for
+ * @size: size allocation in bytes
+ * @align: alignment
+ *
+ * Allocate @size bytes aligned at @align for cpu @cpu.  This wrapper
+ * does the right thing for NUMA regardless of the current
+ * configuration.
+ *
+ * RETURNS:
+ * Pointer to the allocated area on success, NULL on failure.
+ */
+static void * __init pcpu_alloc_bootmem(unsigned int cpu, unsigned long size,
+                                        unsigned long align)
+{
+        const unsigned long goal = __pa(MAX_DMA_ADDRESS);
+#ifdef CONFIG_NEED_MULTIPLE_NODES
+        int node = cpu_to_node(cpu);
+        void *ptr;
+
+        if (!node_online(node) || !NODE_DATA(node)) {
+                ptr = __alloc_bootmem(size, align, goal);
+                pr_info("cpu %d has no node %d or node-local memory\n",
+                        cpu, node);
+                pr_debug("per cpu data for cpu%d %lu bytes at %016lx\n",
+                         cpu, size, __pa(ptr));
+        } else {
+                ptr = __alloc_bootmem_node(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));
+        }
+        return ptr;
+#else
+        return __alloc_bootmem(size, align, goal);
+#endif
+}
+
+static size_t pcpur_size __initdata;
+static void **pcpur_ptrs __initdata;
+
+static struct page * __init pcpur_get_page(unsigned int cpu, int pageno)
+{
+        size_t off = (size_t)pageno << PAGE_SHIFT;
+
+        if (off >= pcpur_size)
+                return NULL;
+
+        return virt_to_page(pcpur_ptrs[cpu] + off);
+}
+
+#define PCPU_CHUNK_SIZE (4UL * 1024UL * 1024UL)
+
+static void __init pcpu_map_range(unsigned long start, unsigned long end,
+                                  struct page *page)
+{
+        unsigned long pfn = page_to_pfn(page);
+        unsigned long pte_base;
+
+        BUG_ON((pfn<<PAGE_SHIFT)&(PCPU_CHUNK_SIZE - 1UL));
+
+        pte_base = (_PAGE_VALID | _PAGE_SZ4MB_4U |
+                    _PAGE_CP_4U | _PAGE_CV_4U |
+                    _PAGE_P_4U | _PAGE_W_4U);
+        if (tlb_type == hypervisor)
+                pte_base = (_PAGE_VALID | _PAGE_SZ4MB_4V |
+                            _PAGE_CP_4V | _PAGE_CV_4V |
+                            _PAGE_P_4V | _PAGE_W_4V);
+
+        while (start < end) {
+                pgd_t *pgd = pgd_offset_k(start);
+                unsigned long this_end;
+                pud_t *pud;
+                pmd_t *pmd;
+                pte_t *pte;
+
+                pud = pud_offset(pgd, start);
+                if (pud_none(*pud)) {
+                        pmd_t *new;
+
+                        new = __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
+                        pud_populate(&init_mm, pud, new);
+                }
+
+                pmd = pmd_offset(pud, start);
+                if (!pmd_present(*pmd)) {
+                        pte_t *new;
+
+                        new = __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
+                        pmd_populate_kernel(&init_mm, pmd, new);
+                }
+
+                pte = pte_offset_kernel(pmd, start);
+                this_end = (start + PMD_SIZE) & PMD_MASK;
+                if (this_end > end)
+                        this_end = end;
+
+                while (start < this_end) {
+                        unsigned long paddr = pfn << PAGE_SHIFT;
+
+                        pte_val(*pte) = (paddr | pte_base);
+
+                        start += PAGE_SIZE;
+                        pte++;
+                        pfn++;
+                }
+        }
+}
+
 void __init setup_per_cpu_areas(void)
 {
-        unsigned long size, i, nr_possible_cpus = num_possible_cpus();
-        char *ptr;
+        size_t dyn_size, static_size = __per_cpu_end - __per_cpu_start;
+        static struct vm_struct vm;
+        unsigned long delta, cpu;
+        size_t pcpu_unit_size;
+        size_t ptrs_size;
+
+        pcpur_size = PFN_ALIGN(static_size + PERCPU_MODULE_RESERVE +
+                               PERCPU_DYNAMIC_RESERVE);
+        dyn_size = pcpur_size - static_size - PERCPU_MODULE_RESERVE;
+
+
+        ptrs_size = PFN_ALIGN(num_possible_cpus() * sizeof(pcpur_ptrs[0]));
+        pcpur_ptrs = alloc_bootmem(ptrs_size);
+
+        for_each_possible_cpu(cpu) {
+                pcpur_ptrs[cpu] = pcpu_alloc_bootmem(cpu, PCPU_CHUNK_SIZE,
+                                                     PCPU_CHUNK_SIZE);
+
+                free_bootmem(__pa(pcpur_ptrs[cpu] + pcpur_size),
+                             PCPU_CHUNK_SIZE - pcpur_size);
+
+                memcpy(pcpur_ptrs[cpu], __per_cpu_load, static_size);
+        }
+
+        /* allocate address and map */
+        vm.flags = VM_ALLOC;
+        vm.size = num_possible_cpus() * PCPU_CHUNK_SIZE;
+        vm_area_register_early(&vm, PCPU_CHUNK_SIZE);
+
+        for_each_possible_cpu(cpu) {
+                unsigned long start = (unsigned long) vm.addr;
+                unsigned long end;
+
+                start += cpu * PCPU_CHUNK_SIZE;
+                end = start + PCPU_CHUNK_SIZE;
+                pcpu_map_range(start, end, virt_to_page(pcpur_ptrs[cpu]));
+        }
+
+        pcpu_unit_size = pcpu_setup_first_chunk(pcpur_get_page, static_size,
+                                                PERCPU_MODULE_RESERVE, dyn_size,
+                                                PCPU_CHUNK_SIZE, vm.addr, NULL);
 
-        /* Copy section for each CPU (we discard the original) */
-        size = ALIGN(PERCPU_ENOUGH_ROOM, PAGE_SIZE);
-        ptr = alloc_bootmem_pages(size * nr_possible_cpus);
+        free_bootmem(__pa(pcpur_ptrs), ptrs_size);
 
-        for_each_possible_cpu(i) {
-                __per_cpu_offset(i) = ptr - __per_cpu_start;
-                memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
-                ptr += 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;
         }
 
         /* Setup %g5 for the boot cpu.  */