diff options
author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2009-07-23 23:15:16 +0000 |
---|---|---|
committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2009-08-20 10:12:40 +1000 |
commit | a245067e204f69c69abf92d94fc45ec65bf1f07e (patch) | |
tree | 8a9ee8920c8b42d5d13cd2f7a05f578d99dd438e /arch/powerpc | |
parent | 1fe1a21005c14ad772caeb9005580f473c4b6c57 (diff) |
powerpc/mm: Add support for early ioremap on non-hash 64-bit processors
This adds some code to do early ioremap's using page tables instead of
bolting entries in the hash table. This will be used by the upcoming
64-bits BookE port.
The patch also changes the test for early vs. late ioremap to use
slab_is_available() instead of our old hackish mem_init_done.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc')
-rw-r--r-- | arch/powerpc/mm/pgtable_64.c | 59 |
1 files changed, 54 insertions, 5 deletions
diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c index bfa7db6b2fd..93ed1a3c872 100644 --- a/arch/powerpc/mm/pgtable_64.c +++ b/arch/powerpc/mm/pgtable_64.c @@ -33,6 +33,8 @@ #include <linux/stddef.h> #include <linux/vmalloc.h> #include <linux/init.h> +#include <linux/bootmem.h> +#include <linux/lmb.h> #include <asm/pgalloc.h> #include <asm/page.h> @@ -55,19 +57,36 @@ unsigned long ioremap_bot = IOREMAP_BASE; + +#ifdef CONFIG_PPC_MMU_NOHASH +static void *early_alloc_pgtable(unsigned long size) +{ + void *pt; + + if (init_bootmem_done) + pt = __alloc_bootmem(size, size, __pa(MAX_DMA_ADDRESS)); + else + pt = __va(lmb_alloc_base(size, size, + __pa(MAX_DMA_ADDRESS))); + memset(pt, 0, size); + + return pt; +} +#endif /* CONFIG_PPC_MMU_NOHASH */ + /* - * map_io_page currently only called by __ioremap - * map_io_page adds an entry to the ioremap page table + * map_kernel_page currently only called by __ioremap + * map_kernel_page adds an entry to the ioremap page table * and adds an entry to the HPT, possibly bolting it */ -static int map_io_page(unsigned long ea, unsigned long pa, int flags) +static int map_kernel_page(unsigned long ea, unsigned long pa, int flags) { pgd_t *pgdp; pud_t *pudp; pmd_t *pmdp; pte_t *ptep; - if (mem_init_done) { + if (slab_is_available()) { pgdp = pgd_offset_k(ea); pudp = pud_alloc(&init_mm, pgdp, ea); if (!pudp) @@ -81,6 +100,35 @@ static int map_io_page(unsigned long ea, unsigned long pa, int flags) set_pte_at(&init_mm, ea, ptep, pfn_pte(pa >> PAGE_SHIFT, __pgprot(flags))); } else { +#ifdef CONFIG_PPC_MMU_NOHASH + /* Warning ! This will blow up if bootmem is not initialized + * which our ppc64 code is keen to do that, we'll need to + * fix it and/or be more careful + */ + pgdp = pgd_offset_k(ea); +#ifdef PUD_TABLE_SIZE + if (pgd_none(*pgdp)) { + pudp = early_alloc_pgtable(PUD_TABLE_SIZE); + BUG_ON(pudp == NULL); + pgd_populate(&init_mm, pgdp, pudp); + } +#endif /* PUD_TABLE_SIZE */ + pudp = pud_offset(pgdp, ea); + if (pud_none(*pudp)) { + pmdp = early_alloc_pgtable(PMD_TABLE_SIZE); + BUG_ON(pmdp == NULL); + pud_populate(&init_mm, pudp, pmdp); + } + pmdp = pmd_offset(pudp, ea); + if (!pmd_present(*pmdp)) { + ptep = early_alloc_pgtable(PAGE_SIZE); + BUG_ON(ptep == NULL); + pmd_populate_kernel(&init_mm, pmdp, ptep); + } + ptep = pte_offset_kernel(pmdp, ea); + set_pte_at(&init_mm, ea, ptep, pfn_pte(pa >> PAGE_SHIFT, + __pgprot(flags))); +#else /* CONFIG_PPC_MMU_NOHASH */ /* * If the mm subsystem is not fully up, we cannot create a * linux page table entry for this mapping. Simply bolt an @@ -93,6 +141,7 @@ static int map_io_page(unsigned long ea, unsigned long pa, int flags) "memory at %016lx !\n", pa); return -ENOMEM; } +#endif /* !CONFIG_PPC_MMU_NOHASH */ } return 0; } @@ -124,7 +173,7 @@ void __iomem * __ioremap_at(phys_addr_t pa, void *ea, unsigned long size, WARN_ON(size & ~PAGE_MASK); for (i = 0; i < size; i += PAGE_SIZE) - if (map_io_page((unsigned long)ea+i, pa+i, flags)) + if (map_kernel_page((unsigned long)ea+i, pa+i, flags)) return NULL; return (void __iomem *)ea; |