#include "pgalloc-track.h"
#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
-static int __read_mostly ioremap_p4d_capable;
-static int __read_mostly ioremap_pud_capable;
-static int __read_mostly ioremap_pmd_capable;
-static int __read_mostly ioremap_huge_disabled;
+static unsigned int __ro_after_init iomap_max_page_shift = BITS_PER_LONG - 1;
static int __init set_nohugeiomap(char *str)
{
- ioremap_huge_disabled = 1;
+ iomap_max_page_shift = PAGE_SHIFT;
return 0;
}
early_param("nohugeiomap", set_nohugeiomap);
-
-void __init ioremap_huge_init(void)
-{
- if (!ioremap_huge_disabled) {
- if (arch_ioremap_p4d_supported())
- ioremap_p4d_capable = 1;
- if (arch_ioremap_pud_supported())
- ioremap_pud_capable = 1;
- if (arch_ioremap_pmd_supported())
- ioremap_pmd_capable = 1;
- }
-}
-
-static inline int ioremap_p4d_enabled(void)
-{
- return ioremap_p4d_capable;
-}
-
-static inline int ioremap_pud_enabled(void)
-{
- return ioremap_pud_capable;
-}
-
-static inline int ioremap_pmd_enabled(void)
-{
- return ioremap_pmd_capable;
-}
-
-#else /* !CONFIG_HAVE_ARCH_HUGE_VMAP */
-static inline int ioremap_p4d_enabled(void) { return 0; }
-static inline int ioremap_pud_enabled(void) { return 0; }
-static inline int ioremap_pmd_enabled(void) { return 0; }
+#else /* CONFIG_HAVE_ARCH_HUGE_VMAP */
+static const unsigned int iomap_max_page_shift = PAGE_SHIFT;
#endif /* CONFIG_HAVE_ARCH_HUGE_VMAP */
-static int ioremap_pte_range(pmd_t *pmd, unsigned long addr,
- unsigned long end, phys_addr_t phys_addr, pgprot_t prot,
- pgtbl_mod_mask *mask)
-{
- pte_t *pte;
- u64 pfn;
-
- pfn = phys_addr >> PAGE_SHIFT;
- pte = pte_alloc_kernel_track(pmd, addr, mask);
- if (!pte)
- return -ENOMEM;
- do {
- BUG_ON(!pte_none(*pte));
- set_pte_at(&init_mm, addr, pte, pfn_pte(pfn, prot));
- pfn++;
- } while (pte++, addr += PAGE_SIZE, addr != end);
- *mask |= PGTBL_PTE_MODIFIED;
- return 0;
-}
-
-static int ioremap_try_huge_pmd(pmd_t *pmd, unsigned long addr,
- unsigned long end, phys_addr_t phys_addr,
- pgprot_t prot)
-{
- if (!ioremap_pmd_enabled())
- return 0;
-
- if ((end - addr) != PMD_SIZE)
- return 0;
-
- if (!IS_ALIGNED(addr, PMD_SIZE))
- return 0;
-
- if (!IS_ALIGNED(phys_addr, PMD_SIZE))
- return 0;
-
- if (pmd_present(*pmd) && !pmd_free_pte_page(pmd, addr))
- return 0;
-
- return pmd_set_huge(pmd, phys_addr, prot);
-}
-
-static inline int ioremap_pmd_range(pud_t *pud, unsigned long addr,
- unsigned long end, phys_addr_t phys_addr, pgprot_t prot,
- pgtbl_mod_mask *mask)
-{
- pmd_t *pmd;
- unsigned long next;
-
- pmd = pmd_alloc_track(&init_mm, pud, addr, mask);
- if (!pmd)
- return -ENOMEM;
- do {
- next = pmd_addr_end(addr, end);
-
- if (ioremap_try_huge_pmd(pmd, addr, next, phys_addr, prot)) {
- *mask |= PGTBL_PMD_MODIFIED;
- continue;
- }
-
- if (ioremap_pte_range(pmd, addr, next, phys_addr, prot, mask))
- return -ENOMEM;
- } while (pmd++, phys_addr += (next - addr), addr = next, addr != end);
- return 0;
-}
-
-static int ioremap_try_huge_pud(pud_t *pud, unsigned long addr,
- unsigned long end, phys_addr_t phys_addr,
- pgprot_t prot)
-{
- if (!ioremap_pud_enabled())
- return 0;
-
- if ((end - addr) != PUD_SIZE)
- return 0;
-
- if (!IS_ALIGNED(addr, PUD_SIZE))
- return 0;
-
- if (!IS_ALIGNED(phys_addr, PUD_SIZE))
- return 0;
-
- if (pud_present(*pud) && !pud_free_pmd_page(pud, addr))
- return 0;
-
- return pud_set_huge(pud, phys_addr, prot);
-}
-
-static inline int ioremap_pud_range(p4d_t *p4d, unsigned long addr,
- unsigned long end, phys_addr_t phys_addr, pgprot_t prot,
- pgtbl_mod_mask *mask)
-{
- pud_t *pud;
- unsigned long next;
-
- pud = pud_alloc_track(&init_mm, p4d, addr, mask);
- if (!pud)
- return -ENOMEM;
- do {
- next = pud_addr_end(addr, end);
-
- if (ioremap_try_huge_pud(pud, addr, next, phys_addr, prot)) {
- *mask |= PGTBL_PUD_MODIFIED;
- continue;
- }
-
- if (ioremap_pmd_range(pud, addr, next, phys_addr, prot, mask))
- return -ENOMEM;
- } while (pud++, phys_addr += (next - addr), addr = next, addr != end);
- return 0;
-}
-
-static int ioremap_try_huge_p4d(p4d_t *p4d, unsigned long addr,
- unsigned long end, phys_addr_t phys_addr,
- pgprot_t prot)
-{
- if (!ioremap_p4d_enabled())
- return 0;
-
- if ((end - addr) != P4D_SIZE)
- return 0;
-
- if (!IS_ALIGNED(addr, P4D_SIZE))
- return 0;
-
- if (!IS_ALIGNED(phys_addr, P4D_SIZE))
- return 0;
-
- if (p4d_present(*p4d) && !p4d_free_pud_page(p4d, addr))
- return 0;
-
- return p4d_set_huge(p4d, phys_addr, prot);
-}
-
-static inline int ioremap_p4d_range(pgd_t *pgd, unsigned long addr,
- unsigned long end, phys_addr_t phys_addr, pgprot_t prot,
- pgtbl_mod_mask *mask)
-{
- p4d_t *p4d;
- unsigned long next;
-
- p4d = p4d_alloc_track(&init_mm, pgd, addr, mask);
- if (!p4d)
- return -ENOMEM;
- do {
- next = p4d_addr_end(addr, end);
-
- if (ioremap_try_huge_p4d(p4d, addr, next, phys_addr, prot)) {
- *mask |= PGTBL_P4D_MODIFIED;
- continue;
- }
-
- if (ioremap_pud_range(p4d, addr, next, phys_addr, prot, mask))
- return -ENOMEM;
- } while (p4d++, phys_addr += (next - addr), addr = next, addr != end);
- return 0;
-}
-
int ioremap_page_range(unsigned long addr,
unsigned long end, phys_addr_t phys_addr, pgprot_t prot)
{
- pgd_t *pgd;
- unsigned long start;
- unsigned long next;
- int err;
- pgtbl_mod_mask mask = 0;
-
- might_sleep();
- BUG_ON(addr >= end);
-
- start = addr;
- pgd = pgd_offset_k(addr);
- do {
- next = pgd_addr_end(addr, end);
- err = ioremap_p4d_range(pgd, addr, next, phys_addr, prot,
- &mask);
- if (err)
- break;
- } while (pgd++, phys_addr += (next - addr), addr = next, addr != end);
-
- flush_cache_vmap(start, end);
-
- if (mask & ARCH_PAGE_TABLE_SYNC_MASK)
- arch_sync_kernel_mappings(start, end);
-
- return err;
+ return vmap_range(addr, end, phys_addr, prot, iomap_max_page_shift);
}
#ifdef CONFIG_GENERIC_IOREMAP
projects / linux-2.6-microblaze.git / blobdiff