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authorMax Filippov <jcmvbkbc@gmail.com>2014-07-15 02:49:15 +0400
committerMax Filippov <jcmvbkbc@gmail.com>2014-08-14 11:59:18 +0400
commitdec7305d9f752f6ad2ec30ec8a723182437c5aa5 (patch)
tree64efbfc6a94cf439b3ff21afb0fe9f06e2b31182 /arch/xtensa
parent22def7681186f65f4f1256ae9b0b6db2a7720cb1 (diff)
downloadlinux-dec7305d9f752f6ad2ec30ec8a723182437c5aa5.tar.xz
xtensa: allow fixmap and kmap span more than one page table
To support aliasing cache both kmap region sizes are multiplied by the number of data cache colors. After that expansion page tables that cover kmap regions may become larger than one page. Correctly allocate and initialize page tables in this case. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'arch/xtensa')
-rw-r--r--arch/xtensa/mm/mmu.c38
1 files changed, 22 insertions, 16 deletions
diff --git a/arch/xtensa/mm/mmu.c b/arch/xtensa/mm/mmu.c
index 3429b483d9f8..abe4513eb0dd 100644
--- a/arch/xtensa/mm/mmu.c
+++ b/arch/xtensa/mm/mmu.c
@@ -18,32 +18,38 @@
#include <asm/io.h>
#if defined(CONFIG_HIGHMEM)
-static void * __init init_pmd(unsigned long vaddr)
+static void * __init init_pmd(unsigned long vaddr, unsigned long n_pages)
{
pgd_t *pgd = pgd_offset_k(vaddr);
pmd_t *pmd = pmd_offset(pgd, vaddr);
+ pte_t *pte;
+ unsigned long i;
- if (pmd_none(*pmd)) {
- unsigned i;
- pte_t *pte = alloc_bootmem_low_pages(PAGE_SIZE);
+ n_pages = ALIGN(n_pages, PTRS_PER_PTE);
- for (i = 0; i < 1024; i++)
- pte_clear(NULL, 0, pte + i);
+ pr_debug("%s: vaddr: 0x%08lx, n_pages: %ld\n",
+ __func__, vaddr, n_pages);
- set_pmd(pmd, __pmd(((unsigned long)pte) & PAGE_MASK));
- BUG_ON(pte != pte_offset_kernel(pmd, 0));
- pr_debug("%s: vaddr: 0x%08lx, pmd: 0x%p, pte: 0x%p\n",
- __func__, vaddr, pmd, pte);
- return pte;
- } else {
- return pte_offset_kernel(pmd, 0);
+ pte = alloc_bootmem_low_pages(n_pages * sizeof(pte_t));
+
+ for (i = 0; i < n_pages; ++i)
+ pte_clear(NULL, 0, pte + i);
+
+ for (i = 0; i < n_pages; i += PTRS_PER_PTE, ++pmd) {
+ pte_t *cur_pte = pte + i;
+
+ BUG_ON(!pmd_none(*pmd));
+ set_pmd(pmd, __pmd(((unsigned long)cur_pte) & PAGE_MASK));
+ BUG_ON(cur_pte != pte_offset_kernel(pmd, 0));
+ pr_debug("%s: pmd: 0x%p, pte: 0x%p\n",
+ __func__, pmd, cur_pte);
}
+ return pte;
}
static void __init fixedrange_init(void)
{
- BUILD_BUG_ON(FIXADDR_SIZE > PMD_SIZE);
- init_pmd(__fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK);
+ init_pmd(__fix_to_virt(0), __end_of_fixed_addresses);
}
#endif
@@ -52,7 +58,7 @@ void __init paging_init(void)
memset(swapper_pg_dir, 0, PAGE_SIZE);
#ifdef CONFIG_HIGHMEM
fixedrange_init();
- pkmap_page_table = init_pmd(PKMAP_BASE);
+ pkmap_page_table = init_pmd(PKMAP_BASE, LAST_PKMAP);
kmap_init();
#endif
}