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-rw-r--r--mm/percpu.c71
1 files changed, 54 insertions, 17 deletions
diff --git a/mm/percpu.c b/mm/percpu.c
index 27b0f40..f3fe7bc 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -632,6 +632,13 @@ static void pcpu_depopulate_chunk(struct pcpu_chunk *chunk, int off, int size,
pcpu_unmap(chunk, unmap_start, unmap_end, flush);
}
+static int __pcpu_map_pages(unsigned long addr, struct page **pages,
+ int nr_pages)
+{
+ return map_kernel_range_noflush(addr, nr_pages << PAGE_SHIFT,
+ PAGE_KERNEL, pages);
+}
+
/**
* pcpu_map - map pages into a pcpu_chunk
* @chunk: chunk of interest
@@ -651,11 +658,9 @@ static int pcpu_map(struct pcpu_chunk *chunk, int page_start, int page_end)
WARN_ON(chunk->immutable);
for_each_possible_cpu(cpu) {
- err = map_kernel_range_noflush(
- pcpu_chunk_addr(chunk, cpu, page_start),
- (page_end - page_start) << PAGE_SHIFT,
- PAGE_KERNEL,
- pcpu_chunk_pagep(chunk, cpu, page_start));
+ err = __pcpu_map_pages(pcpu_chunk_addr(chunk, cpu, page_start),
+ pcpu_chunk_pagep(chunk, cpu, page_start),
+ page_end - page_start);
if (err < 0)
return err;
}
@@ -1274,12 +1279,12 @@ ssize_t __init pcpu_embed_first_chunk(size_t static_size, size_t reserved_size,
* 4k page first chunk setup helper.
*/
static struct page **pcpu4k_pages __initdata;
-static int pcpu4k_nr_static_pages __initdata;
+static int pcpu4k_unit_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];
+ if (pageno < pcpu4k_unit_pages)
+ return pcpu4k_pages[cpu * pcpu4k_unit_pages + pageno];
return NULL;
}
@@ -1306,22 +1311,24 @@ ssize_t __init pcpu_4k_first_chunk(size_t static_size, size_t reserved_size,
pcpu_fc_free_fn_t free_fn,
pcpu_fc_populate_pte_fn_t populate_pte_fn)
{
+ static struct vm_struct vm;
size_t pages_size;
unsigned int cpu;
int i, j;
ssize_t ret;
- pcpu4k_nr_static_pages = PFN_UP(static_size);
+ pcpu4k_unit_pages = PFN_UP(max_t(size_t, static_size + reserved_size,
+ PCPU_MIN_UNIT_SIZE));
/* unaligned allocations can't be freed, round up to page size */
- pages_size = PFN_ALIGN(pcpu4k_nr_static_pages * num_possible_cpus() *
+ pages_size = PFN_ALIGN(pcpu4k_unit_pages * num_possible_cpus() *
sizeof(pcpu4k_pages[0]));
pcpu4k_pages = alloc_bootmem(pages_size);
- /* allocate and copy */
+ /* allocate pages */
j = 0;
for_each_possible_cpu(cpu)
- for (i = 0; i < pcpu4k_nr_static_pages; i++) {
+ for (i = 0; i < pcpu4k_unit_pages; i++) {
void *ptr;
ptr = alloc_fn(cpu, PAGE_SIZE);
@@ -1330,18 +1337,48 @@ ssize_t __init pcpu_4k_first_chunk(size_t static_size, size_t reserved_size,
"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);
}
+ /* allocate vm area, map the pages and copy static data */
+ vm.flags = VM_ALLOC;
+ vm.size = num_possible_cpus() * pcpu4k_unit_pages << PAGE_SHIFT;
+ vm_area_register_early(&vm, PAGE_SIZE);
+
+ for_each_possible_cpu(cpu) {
+ unsigned long unit_addr = (unsigned long)vm.addr +
+ (cpu * pcpu4k_unit_pages << PAGE_SHIFT);
+
+ for (i = 0; i < pcpu4k_unit_pages; i++)
+ populate_pte_fn(unit_addr + (i << PAGE_SHIFT));
+
+ /* pte already populated, the following shouldn't fail */
+ ret = __pcpu_map_pages(unit_addr,
+ &pcpu4k_pages[cpu * pcpu4k_unit_pages],
+ pcpu4k_unit_pages);
+ if (ret < 0)
+ panic("failed to map percpu area, err=%zd\n", ret);
+
+ /*
+ * FIXME: Archs with virtual cache should flush local
+ * cache for the linear mapping here - something
+ * equivalent to flush_cache_vmap() on the local cpu.
+ * flush_cache_vmap() can't be used as most supporting
+ * data structures are not set up yet.
+ */
+
+ /* copy static data */
+ memcpy((void *)unit_addr, __per_cpu_load, static_size);
+ }
+
/* we're ready, commit */
- pr_info("PERCPU: Allocated %d 4k pages, static data %zu bytes\n",
- pcpu4k_nr_static_pages, static_size);
+ pr_info("PERCPU: %d 4k pages per cpu, static data %zu bytes\n",
+ pcpu4k_unit_pages, static_size);
ret = pcpu_setup_first_chunk(pcpu4k_get_page, static_size,
reserved_size, -1,
- -1, NULL, populate_pte_fn);
+ pcpu4k_unit_pages << PAGE_SHIFT, vm.addr,
+ NULL);
goto out_free_ar;
enomem:
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